A Method for Calibrating Ex-core Detectors Using a Single In-Heap Flux Measurement

Abstract

The invention discloses a method for finishing out-of-pile detector scales through single in-pile flux measurement. The method is combined with site actual measurement and software numerical simulation calculation, pile core numerical simulation software is utilized to generate different axial power distribution shapes which are obtained by actually performing operation on a reaction pile in a traditional method, meanwhile primary in-pile flux measurement results of a nuclear power plant are utilized to obtain flexibility of all out-of-pile detectors, furthermore the detector flexibility is applied to correcting out-of-pile detector current obtained by software calculation, and finally a traditional data treating method is utilized to generate out-of-pile detector scale coefficients. According to the method disclosed by the invention, artificial disturbance is prevented from being introduced into the nuclear reaction pile, a nuclear accident risk is reduced, meanwhile considerable economical benefit is brought to the nuclear power plant, and finally the method can be applied to all active-service nuclear power units in China.

Description

Technical field [0001] The invention belongs to the technical field of nuclear power, and particularly relates to a method for calibrating an off-stack detector in a nuclear power plant. Background technique [0002] A nuclear reactor is the heart component of a nuclear power plant. It is a place where nuclear energy is continuously converted into heat energy. It is also the place where radioactivity is most concentrated in a nuclear power plant. Always ensuring the safety of nuclear reactors and avoiding radioactive leakage are the most fundamental propositions of nuclear power plants. In order to provide continuous monitoring of nuclear reactors that are always sealed in heavy steel pressure vessels during operation, my country’s currently mass-built pressurized water reactor nuclear power plants are equipped with off-reactor nuclear radiation monitoring systems. The system has the ability to provide full monitoring of nuclear reactors from start-up to rated power operation. T...

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Problems solved by technology

[0024] First of all, this method still needs to implement a traditional multi-point method after each refueling overhaul, so the disadvantages related to the multi-point method cannot be completely eliminated in this method;

[0025] Secondly, the implementation of this method is based on the premise that the site is equipped with a three-dimensional core on-line monitoring system like BEACON, but almost all in-service PWR nuclear power plants in my country are not equipped with similar systems, which makes the application of this method greatly affected. limit

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